Spool-type-disk strain-insulator.



I L STEINBERGER SPOOL TYPE DISK STRMN INSULATOR.

APPLICATION FILED AUG.7, I912.

Patented Dec. 28, 1915.

"IVE/ ran Br manna for the reception of the rod 4, and the outer end faces of the extensions being engaged by the inner faces of the end portions of the bail, and the heads clamping said bail ends rigidly in place. At the opposite ends of the body 12 are formed disks 12 each of which is provided with a plurality of axially arranged ridges 14, and 16, disposed about the extensions 13, the ridge 14 being of relatively large cross-section and projecting for a relatively greater distance from said disks than the ridges 15 and 16 which are of successively reduced proportions. The ridge 14- is closest about the extension 13, and the ridges 15 and 16 are spaced concentrically between the ridge 14 and the outer annular edge 17 ofthe disks. The outer edge of the ridge 14- is thus nearest the outer end sur face of the adjacent extension 13, and the outer edges of the ridges 15 and 16, and the annular edge 17 of the body 12, rccede,

preferably uniformly, from the vertical plane of the outer edge of the ridge 14, so as to maintain a considerable distance between all parts of the insulating member and the adjacent inner surface portions of the bail 6 without the necessity for forming a decided bulge in the bail. 7

Intermediate its ends the annular sur face of the body portion 12 is considerably reduced and forms an annular seat 18 for the encircling band 19 of conducting mate rial, which band forms a support either for the next adjacent unit below or for the supported line wire. The walls defining the reduced portion 18 preferably are arranged at an incline extending from the annular edges of said reduced portion substantially to the annular edges 17 of the disks, so that practically the whole annular surface of the insulator inclines toward the member 19 and produces the flange-like parts or disks on said body extending beyond the seat 18. The opposing walls or surfaces of the disks, which would naturally conduct liquid directly to the member 19 are formed, how ever, with means adapted effectually to prevent such a flow, said means comprising preferably a series of radially projecting, annular, concentric ridges 20, which are preferably of relatively small cross-section. These ridges provide decided annular-depressions 21, forming conducting paths about the walls, along which liquid, intercepted by the ridges, flows to the lower side of the body and drips therein-mu, not having been allowed to come into contact with any metallic portion of the unit.

It has been an important object of this invention to maintain the metallic parts of the structure in. as simple and inexpensive design possible and to form the insulating member of each unit of integral ccmstruction so shaped as to be readily molded, but coinparts carefully arranged to eil'ecgrooves about said wal rially and effectively increase the surface distance between the units. The formation is also such as to present decidedly different shapes of moisture resisting surfaces at any one side of the column and thus to provide, more effectually, moisture proof parts intermediate the upper and lower ends of the column.

The bands 19 are preferably divided and. detachably connected togathe; by suit ble screws 22 extending through outstaiu lugs 23 formed on the acent end portions thereof, so that the band may be readily attached and detached at will. The bands in tended to support a suspended unit, have their lower section formed with a lug 2 2, apertured as at 25, and adapted to receive one of the bolts 10. For the lowest it in the column the lug preferably 1 med with a threaded aperture adapted to receive the upper end of a rod or ink 26 pends from said. unit into i; ment with lug 27 formed upon a clam the clamp, in turn, engaging and directl. supporting the conductor wire 29.

As many changes could be made in this construction without departing from the portion intermediate its length formed be tween opposingly disposed. annular'walls which flare abruptly outwardlyfrom said annular reduced portion, and said walls ha ring each an annular ridge thereon between its outer periphery and said annular reduced portion, adapted to form r interce llow of liquid along saiu walls too, relatively rcdiured portion and cowlv said liquid oil of the insulator at a point removed from said annular reduced portion. 2. [in insulator comprising a cylindrical body disposed horizontally, having a relatively reduced annular portion intermediate its ends formed between conically shaped walls, flaring abruptly outwardly from said annular reduced portion and inclining in all radial directions toward said annular reduced portion, and each of said walls being med 1th a plurality of annular subcoiucntr aidi v, ly ou at the outer peapheru tially at right angles to the longitudinal axis of the insulator, said ridges being of successively increasing diameters from said reduced annular portion oi'itwardly, so as to provide a. plurality of annular grooves on said Walls between them adapted to intercept the flow of moisture along said Walls toward said annular reduced portion, and to conduct said moisture of? of the under side of the insulator at a point removed 10 from said annular reduced portion.

In testimony whereof, I affix my signature in the presence of two Witnesses.

LOUIS STEINBERGER.

Witnesses L. GUsFom) HANDIE, NATHALIE THOMPSON. 

